The Blum hinges recommend #7 for attaching the face frame adapters to the face frames. I could probably use #6, but I actually HAVE some #7 … just not enough of them. :)

and I just placed an order at McFeely’s for 6×1/2 and 6×3/4 truss heads. I’m going to go have a look at those adapter plates and see if a #6 would work as well as a #7. I don’t think I have any #8 to try….